Merge "Implementing breadcrumb for tablet devices for navigation in the bar."

1 files changed, 137 insertions, 0 deletions

diff --git a/packages/DocumentsUI/src/com/android/documentsui/NavigationViewManager.java b/packages/DocumentsUI/src/com/android/documentsui/NavigationViewManager.java
new file mode 100644
index 000000000000..25542461748a
--- /dev/null
+++ b/packages/DocumentsUI/src/com/android/documentsui/NavigationViewManager.java
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.documentsui;
+
+import static com.android.documentsui.Shared.DEBUG;
+
+import android.annotation.Nullable;
+import android.graphics.drawable.Drawable;
+import android.util.Log;
+import android.view.View;
+
+import com.android.documentsui.dirlist.AnimationView;
+import com.android.documentsui.model.RootInfo;
+
+import java.util.function.Consumer;
+
+/**
+ * A facade over the portions of the app and drawer toolbars.
+ */
+public class NavigationViewManager {
+
+    private static final String TAG = "NavigationViewManager";
+
+    final DrawerController mDrawer;
+    final DocumentsToolbar mToolbar;
+    final State mState;
+    final NavigationViewManager.Environment mEnv;
+    final Breadcrumb mBreadcrumb;
+
+    public NavigationViewManager(
+            DrawerController drawer,
+            DocumentsToolbar toolbar,
+            State state,
+            NavigationViewManager.Environment env,
+            Breadcrumb breadcrumb) {
+
+        mToolbar = toolbar;
+        mDrawer = drawer;
+        mState = state;
+        mEnv = env;
+        mBreadcrumb = breadcrumb;
+        mBreadcrumb.setup(env, state, this::onNavigationItemSelected);
+
+        mToolbar.setNavigationOnClickListener(
+                new View.OnClickListener() {
+                    @Override
+                    public void onClick(View v) {
+                        onNavigationIconClicked();
+                    }
+                });
+    }
+
+    private void onNavigationIconClicked() {
+        if (mDrawer.isPresent()) {
+            mDrawer.setOpen(true, DrawerController.OPENED_HAMBURGER);
+        }
+    }
+
+    void onNavigationItemSelected(int position) {
+        boolean changed = false;
+        while (mState.stack.size() > position + 1) {
+            changed = true;
+            mState.popDocument();
+        }
+        if (changed) {
+            mEnv.refreshCurrentRootAndDirectory(AnimationView.ANIM_LEAVE);
+        }
+    }
+
+    void update() {
+
+        // TODO: Looks to me like this block is never getting hit.
+        if (mEnv.isSearchExpanded()) {
+            mToolbar.setTitle(null);
+            mBreadcrumb.show(false);
+            return;
+        }
+
+        mDrawer.setTitle(mEnv.getDrawerTitle());
+
+        mToolbar.setNavigationIcon(getActionBarIcon());
+        mToolbar.setNavigationContentDescription(R.string.drawer_open);
+
+        if (mState.stack.size() <= 1) {
+            mBreadcrumb.show(false);
+            String title = mEnv.getCurrentRoot().title;
+            if (DEBUG) Log.d(TAG, "New toolbar title is: " + title);
+            mToolbar.setTitle(title);
+        } else {
+            mBreadcrumb.show(true);
+            mToolbar.setTitle(null);
+            mBreadcrumb.postUpdate();
+        }
+
+        if (DEBUG) Log.d(TAG, "Final toolbar title is: " + mToolbar.getTitle());
+    }
+
+    // Hamburger if drawer is present, else sad nullness.
+    private @Nullable Drawable getActionBarIcon() {
+        if (mDrawer.isPresent()) {
+            return mToolbar.getContext().getDrawable(R.drawable.ic_hamburger);
+        } else {
+            return null;
+        }
+    }
+
+    void revealRootsDrawer(boolean open) {
+        mDrawer.setOpen(open);
+    }
+
+    interface Breadcrumb {
+        void setup(Environment env, State state, Consumer<Integer> listener);
+        void show(boolean visibility);
+        void postUpdate();
+    }
+
+    interface Environment {
+        RootInfo getCurrentRoot();
+        String getDrawerTitle();
+        void refreshCurrentRootAndDirectory(int animation);
+        boolean isSearchExpanded();
+    }
+}